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Syncope

Syncope is a temporary loss of consciousness and muscle tone caused by inadequate blood supply to the brain. Syncope is better known as fainting.

Syncope affects people of all ages, from toddlers to the elderly. More than 100,000 adults and children visit a physician each year with complaints of fainting spells.

What causes syncope?

The common reason behind each syncopal or fainting episode is a temporary lack of oxygen-rich (red) blood getting to the brain. However, many different problems can cause a decrease in blood flow to the brain. Types of syncope include:

Vasovagal syncope - The most common type of syncope is called vasovagal syncope. A variety of situations stimulate the vagus nerve, which leads to a slowing of the heart rate and relaxing of the body's blood vessels. With a slow heart rate and dilated blood vessels, less blood gets to the brain, and fainting occurs. Pain and emotional stress can trigger vasovagal syncope in susceptible people. This type of syncope can happen more often in some families.

Orthostatic hypotension - Another cause of syncope is orthostatic hypotension. This is a drop in blood pressure that occurs when a person has been standing for a while, or changes from a sitting to a standing position. Blood tends to pool in the legs, keeping a normal amount of blood from being returned to the heart, and thereby preventing a normal amount of blood from leaving the heart and going to the body. A momentary drop in blood flow to the brain occurs, and a person faints.

Some children have abnormalities of the structures of the heart that can cause syncopal episodes. Heart defects causing "outflow obstruction" may produce fainting because they restrict the blood flow to the body out of the left ventricle. Aortic stenosis and hypertrophic cardiomyopathy diminish the blood flow from the left ventricle through the aorta, and children with these problems may experience syncope.

Irregular or rapid heart rhythms can also trigger syncope. When the heart beats rapidly or irregularly, the heart has less time to fill with blood before it is time to pump whatever blood is within them to the lungs or to the body. If this results in not enough blood reaching the brain, the body’s response is fainting.

Yet another cause of syncope can be an inflammation of the heart muscle known as myocarditis. The heart muscle becomes weakened and is not able to pump as well as normal. The body again reacts to decreased blood flow to the brain by fainting.

Other situations or illnesses that can cause syncope include, but are not limited to, the following:

Head injury

Epilepsy

Stroke

Inner ear problems

Dehydration

Low blood sugar

Breath holding episodes

What are the symptoms of syncope?

The following are the most common symptoms of syncope. However, each child may experience symptoms differently. Also, the symptoms of syncope may resemble other conditions or medical problems. Consult your child's physician for a diagnosis.

Some children will experience presyncope, which is the feeling that they are about to faint. Your child may be able to tell you that he/she is "about to pass out," "feels like I might faint," "feels like the room is spinning," or "feels dizzy." These sensations usually occur immediately before fainting occurs. There may be enough warning to enable your child to sit or lie down before loss of consciousness occurs; this can prevent injuries that may occur due to falling during syncope.

In other instances, the child will have no presyncopal sensations, but will simply faint.

Should my child be seen by a physician after fainting?

Some types of syncope are caused by a serious problem, so it is recommended that your child be seen by a physician to determine the reason of all fainting spells.

How is the cause of syncope diagnosed?

Your child's physician will obtain a medical history and perform a physical examination. The details about the syncopal episodes are helpful in pinpointing the cause: how often they occur, what activity your child was participating in prior to fainting, if there were any presyncopal sensations, and other symptoms provide useful information. Blood pressure may be taken in sitting and standing positions to check for orthostatic hypotension.